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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 356 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02
Question #: 356
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A company wants to move its on-premises network attached storage (NAS) to AWS. The company wants to make the data available to any Linux instances within its VPC and ensure changes are automatically synchronized across all instances accessing the data store. The majority of the data is accessed very rarely, and some files are accessed by multiple users at the same time.
Which solution meets these requirements and is MOST cost-effective?

  • A. Create an Amazon Elastic Block Store (Amazon EBS) snapshot containing the data. Share it with users within the VPC.
  • B. Create an Amazon S3 bucket that has a lifecycle policy set to transition the data to S3 Standard-Infrequent Access (S3 Standard-IA) after the appropriate number of days.
  • C. Create an Amazon Elastic File System (Amazon EFS) file system within the VPC. Set the throughput mode to Provisioned and to the required amount of IOPS to support concurrent usage.
  • D. Create an Amazon Elastic File System (Amazon EFS) file system within the VPC. Set the lifecycle policy to transition the data to EFS Infrequent Access (EFS IA) after the appropriate number of days.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by dmscountera at March 11, 2021, 5:30 p.m.
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dmscountera
Highly Voted 3 years, 7 months ago
D. Create an Amazon Elastic File System (Amazon EFS) file system within the VPC. Set the lifecycle policy to transition the data to EFS Infrequent Access (EFS IA) after the appropriate number of days.
upvoted 33 times
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syu31svc
Highly Voted 3 years, 6 months ago
D is the answer EFS for "some files are accessed by multiple users at the same time" and set lifecycle for "majority of the data is accessed very rarely"
upvoted 11 times
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sofiella
Most Recent 2 years, 2 months ago
While both C and D involve using Amazon Elastic File System (EFS), option C is preferred over option D because of the different configurations for the EFS file system. In option C, the throughput mode is set to Provisioned, which means that the required IOPS can be specified to support concurrent usage of the data by multiple users. This ensures that the EFS file system has the necessary performance to handle the anticipated workload. In option D, the lifecycle policy is set to transition the data to EFS Infrequent Access (EFS IA) after the appropriate number of days. This is not ideal for this use case as EFS IA is designed for infrequently accessed data and is not optimized for concurrent usage. In addition, the transition of data to EFS IA can result in increased latency and decreased performance, making it less suitable for this use case where the data needs to be accessible to multiple users at the same time. Therefore, option C is the most cost-effective and optimal solution for this use case, as it meets the requirements for data availability and performance for concurrent usage by multiple users.
upvoted 2 times
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welcomeYM
2 years, 8 months ago
Selected Answer: D
DDDDDD
upvoted 1 times
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gpikagm
2 years, 11 months ago
Why not C? They are not asking about cost effectiveness or back-up. They want high concurrency, so wont provision mode help?
upvoted 4 times
baconpie282
2 years, 9 months ago
That will help for sure, but the question demands most cost-effective solution
upvoted 2 times
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bora4motion
2 years, 9 months ago
C would be OK if the statement around cost was not there.
upvoted 1 times
sanathsh
2 years, 8 months ago
keyword -> infrequent, so EFS IA would make the most sense
upvoted 1 times
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Javatar
3 years, 2 months ago
why is D, question doesn't mention appropriate number of days
upvoted 5 times
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osel
3 years, 3 months ago
Question stated "data accessible to any Linux instance inside its VPC" which means it is using NFS protocol matching that of EFS, not matching to S3 that is object-based via HTTP API protocol or via NFS File Storage GW.
upvoted 7 times
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LETSGETIT
3 years, 3 months ago
D: https://aws.amazon.com/efs/features/infrequent-access/
upvoted 1 times
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arghyanandy
3 years, 5 months ago
Whenever there is concurrent file access, go for EFS and between C and D, D seems more logical
upvoted 3 times
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jkwek
3 years, 5 months ago
Answer B is not possible because of the sentence"ensure changes are automatically synchronized across all instances accessing the data store." Only EFS can do it.
upvoted 5 times
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KK_uniq
3 years, 6 months ago
Why not S3?
upvoted 3 times
itchi_vo
3 years, 5 months ago
require `guarantee that changes to the data store are immediately synced across all instances that use it` => EFS is faster than S3
upvoted 1 times
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mahdeo01
3 years, 5 months ago
S3 is not the answer because you can not access files simultaneously ( and in the question, it specifically says " some files are accessed by multiple users at the same time."
upvoted 3 times
gargaditya
3 years, 5 months ago
One can access S3 objects parallelly. • Your application can achieve at least 3,500 PUT/COPY/POST/DELETE and 5,500 GET/HEAD requests per second per prefix in a bucket. But I guess 'immediately synced across all instances' is not possible with S3 ie for making parallel edits, go for EFS or EBS multiattach(io1/io2/io2 block express). Dont just look at 'cost effective' and get confused(S3 indeed has low cost as compared to more expensive EFS).
upvoted 3 times
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jkwek
3 years, 6 months ago
Answer is D. https://aws.amazon.com/efs/ Amazon EFS offers four storage classes: two Standard storage classes, Amazon EFS Standard and Amazon EFS Standard-Infrequent Access (EFS Standard-IA), and two One Zone storage classes, Amazon EFS One Zone, and Amazon EFS One Zone-Infrequent Access (EFS One Zone-IA).
upvoted 7 times
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Makinto
3 years, 6 months ago
D is the correct answer
upvoted 3 times
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Nilesh_NSW
3 years, 6 months ago
D is correct
upvoted 3 times
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Sallywhite
3 years, 6 months ago
D is correct
upvoted 4 times
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waqas
3 years, 6 months ago
D is sure.
upvoted 6 times
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